Chapter 16 Key Takeaways

The numbers, briefly. In FY2024, the federal government collected approximately $4.9 trillion** in revenue, spent approximately **$6.8 trillion in outlays, and ran a deficit of approximately $1.9 trillion**. Federal debt held by the public was approximately **$28 trillion (about 99% of GDP); total federal debt was approximately $36 trillion. Outlays equaled about 23.4% of GDP; revenues equaled about 17.1% of GDP. The deficit was about 6.4% of GDP — historically large for an economy not in recession.

Where the money goes. Mandatory spending dominates the federal budget at approximately 63% of outlays — about $4.3 trillion — driven by Social Security (~$1.5T), Medicare (~$1.05T gross / ~$865B net), Medicaid (~$650B federal share), and a roughly $1T "other mandatory" category that includes SNAP, federal civilian and military retirement, veterans' compensation, refundable EITC and CTC, and federal student-loan programs. Discretionary spending is approximately 24% — about $1.7 trillion — split between defense (~$910B, 13% of outlays) and non-defense (~$770B, 11% of outlays). Net interest is approximately **13%** — about $880 billion in FY2024, the first time in the postwar era that net interest exceeded defense discretionary.

Where the money comes from. Revenue is dominated by taxes on labor income. Individual income taxes account for approximately 50% of revenue (~$2.4T), payroll taxes (Social Security and Medicare) for approximately **36%** (~$1.7T), corporate income taxes for approximately 11% (~$530B), and excise/customs/estate/miscellaneous for approximately **5%** (~$260B). Federal revenue as a share of GDP has been remarkably stable in the postwar era at roughly 17%, despite substantial variation in statutory rates.

Common misconceptions, corrected. Foreign aid is approximately 1% of outlays; TANF cash welfare is approximately 0.2%; the National Endowment for the Arts, NEH, and CPB combined are approximately 0.014% — well under one-tenth of one percent. Defense is large but smaller than Social Security alone. Cutting all "wasteful spending" identified in popular debate to zero would close approximately 2.5% of outlays; the deficit was 28% of outlays. There is no path to a balanced budget that does not engage major mandatory programs, defense, the revenue base, or a combination.

The textbook budget process. The Congressional Budget Act of 1974 specifies a process: presidential budget submission in February, congressional budget resolution by April, twelve appropriations bills enacted by October 1. Reconciliation is available for legislation that achieves budgetary effects specified in the resolution.

The actual budget process. Since FY1997, all twelve appropriations bills have been enacted on time exactly four times. Most years, the federal government begins the fiscal year operating under a continuing resolution (CR) that funds agencies at prior-year levels. Final appropriations are typically passed as omnibus bills bundling multiple appropriations measures, often hundreds or thousands of pages long, voted on shortly after release. Government shutdowns occur when neither full appropriations nor a CR is enacted; the longest in U.S. history was 35 days (December 2018 — January 2019).

The debt ceiling. A statutory cap on Treasury debt issuance, established in 1917 for administrative convenience and now used as a major political leverage point. The 2011 crisis produced the Budget Control Act (with discretionary caps and the supercommittee/sequester mechanism) and the first-ever S&P downgrade of U.S. sovereign debt. Subsequent crises in 2013, 2017, 2019, 2021, 2023, and 2024–25 have produced additional rating-agency downgrades (Fitch in 2023, Moody's in 2024) and recurring institutional costs. Both parties have used the ceiling as leverage when in opposition; the magnitude and explicitness of the leverage have varied. Most peer democracies do not have a separate debt ceiling.

Reconciliation as the channel for major fiscal legislation. The 1974-created reconciliation process bypasses the Senate filibuster and allows simple-majority passage, subject to the Byrd Rule (which restricts non-budgetary provisions, prohibits Social Security changes, and prohibits provisions that increase the deficit beyond the budget window). Reconciliation has become the channel through which major fiscal legislation now passes — across both parties. The 2001 and 2003 Bush tax cuts, the 2010 ACA sidecar, the 2017 TCJA, the 2021 ARPA, the 2022 IRA, and the 2025 reconciliation effort all followed this template. Major bipartisan fiscal legislation has become rare.

The Congressional Budget Office. Created in 1974 to give Congress its own analytical capacity, CBO is nonpartisan by design and by practice. Its scoring of legislation, while methodologically conservative, is contested by both parties when inconvenient. CBO uses static scoring as the primary methodology and dynamic scoring as a supplementary analysis for major legislation; the institutional compromise leans toward conservatism in counting macroeconomic feedback.

Tax expenditures as hidden spending. Total federal tax expenditures cost approximately **$1.7 trillion** annually in foregone revenue — larger than total discretionary spending, roughly equal to total individual income tax revenue. Major tax expenditures include the exclusion of employer-provided health insurance (~$300B), tax-deferred retirement contributions (~$250B), preferential capital-gains and dividend rates (~$160B), the mortgage-interest deduction, the EITC and CTC, the home-sale capital-gain exclusion, and many others. Tax expenditures typically receive less scrutiny than equivalent direct spending would.

The long-run fiscal trajectory. CBO projects that, under current law, federal outlays grow as a share of GDP (driven by Social Security, Medicare, and net interest), revenues remain roughly stable at 17–18% of GDP, deficits grow to 7–8% of GDP through the 2030s and 2040s, and debt held by the public rises from ~99% today to ~107% by 2029, ~122% by 2034, and continuing higher. The Social Security trust fund is projected to be depleted in the mid-2030s under current law, after which benefits would need to be reduced by approximately 20% absent legislation to fill the shortfall.

Three serious diagnoses, all steel-manned. The conservative diagnosis identifies spending growth — particularly entitlements — as the central problem and proposes entitlement reform. The progressive diagnosis identifies inadequate revenue (particularly relative to peer democracies) as the central problem and proposes higher taxes on high earners and corporations. The centrist diagnosis holds that both must be addressed, in the Simpson-Bowles tradition, through some combination of spending restraint and base-broadening tax reform. The mathematical reality is that neither side alone can close the long-run gap; some combination — or a forced market adjustment — is the realistic path.

The political economy. Three structural forces shape budget politics regardless of party: concentrated benefits and diffuse costs drive long-run spending growth on both sides' priorities; stealth taxation lets revenue grow without explicit votes; the "starve the beast" theory of tax cuts forcing spending discipline has weak empirical support.

The moral dimension. A budget is the most concrete expression of a polity's priorities. Documents lie; budgets do not. The book takes no position on what those moral questions ought to be answered. It does take the position that citizens should know the actual figures before deciding what they think — and that a great deal of political debate proceeds on the basis of inaccurate information about what the budget actually is.